Effect of Maximum Particle Size on Resilient Modulus of Unbound Granule Materials by Repeated Load Triaxial Test

The unbound granule material (UGM) is widely applied as the base/subbase layer in pavement engineering. poor quality of UGMs mainly result differential settlement and fatigue failure UGMs. This paper presents a laboratory investigation on influence maximum particle size (MPS) aggregates resilient modulus (MR) repeated load triaxial tests were performed under different stress levels. Three nonlinear models compared to describe mechanical behavior results show that plays significant role MR When MPS increases from 19mm 26.5mm, its dynamic by 6.8% average. 26.5mm 31.5mm, 13.3% Meanwhile, also dependent deviatory confining pressure. N37A model has better goodness fit than others. In word, it effects should be taken into account design, make sure loading deformation structure more uniform.